Is Sulforhodamine 101 vegetarian?

Sulforhodamine 101 (SR101) is a red fluorescent synthetic dye used in neurophysiology, particularly as a counterstain for astrocytes in calcium imaging experiments. It also labels myelinating oligodendrocytes and has been reported to affect neuronal excitability, requiring cautious use. It is derived entirely from synthetic precursors.

An ingredient is considered vegetarian if it avoids components derived from killing an animal.

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